/**
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */
package org.gudy.azureus2.core3.disk.impl;

import java.util.Arrays;

import org.gudy.azureus2.core3.disk.DiskManagerFileInfo;
import org.gudy.azureus2.core3.disk.DiskManagerFileInfoSet;
import org.gudy.azureus2.core3.download.DownloadManagerState;
import org.gudy.azureus2.core3.util.Debug;

/**
 * @author Aaron Grunthal
 * @create 10.05.2008
 */
public class DiskManagerFileInfoSetImpl implements DiskManagerFileInfoSet {

    final DiskManagerFileInfoImpl[] files;
    final DiskManagerHelper diskManager;

    public DiskManagerFileInfoSetImpl(DiskManagerFileInfoImpl[] files, DiskManagerHelper dm) {
        this.files = files;
        this.diskManager = dm;
    }

    public DiskManagerFileInfo[] getFiles() {
        return files;
    }

    public int nbFiles() {
        return files.length;
    }

    public void setPriority(int[] toChange) {
        if (toChange.length != files.length)
            throw new IllegalArgumentException("array length mismatches the number of files");

        DownloadManagerState dmState = diskManager.getDownloadState();

        try {
            dmState.suppressStateSave(true);

            for (int i = 0; i < files.length; i++)
                if (toChange[i] != 0) {
                    files[i].setPriority(toChange[i]);
                }
        } finally {
            dmState.suppressStateSave(false);
        }
    }

    public void setSkipped(boolean[] toChange, boolean setSkipped) {
        if (toChange.length != files.length)
            throw new IllegalArgumentException("array length mismatches the number of files");

        DownloadManagerState dmState = diskManager.getDownloadState();

        try {
            dmState.suppressStateSave(true);

            if (!setSkipped) {

                String[] types = diskManager.getStorageTypes();

                boolean[] toLinear = new boolean[toChange.length];
                boolean[] toReorder = new boolean[toChange.length];

                int num_linear = 0;
                int num_reorder = 0;

                for (int i = 0; i < toChange.length; i++) {

                    if (toChange[i]) {

                        int old_type = DiskManagerUtil.convertDMStorageTypeFromString(types[i]);

                        if (old_type == DiskManagerFileInfo.ST_COMPACT) {

                            toLinear[i] = true;

                            num_linear++;

                        } else if (old_type == DiskManagerFileInfo.ST_REORDER_COMPACT) {

                            toReorder[i] = true;

                            num_reorder++;
                        }
                    }
                }

                if (num_linear > 0) {

                    if (!Arrays.equals(toLinear, setStorageTypes(toLinear, DiskManagerFileInfo.ST_LINEAR))) {

                        return;
                    }
                }

                if (num_reorder > 0) {

                    if (!Arrays.equals(toReorder, setStorageTypes(toReorder, DiskManagerFileInfo.ST_REORDER))) {

                        return;
                    }
                }
            }
            for (int i = 0; i < files.length; i++)
                if (toChange[i]) {
                    files[i].setSkippedInternal(setSkipped);
                    diskManager.skippedFileSetChanged(files[i]);
                }

            if (!setSkipped)
                DiskManagerUtil.doFileExistenceChecks(this, toChange, diskManager.getDownloadState().getDownloadManager(), true);

        } finally {
            dmState.suppressStateSave(false);
        }

    }

    public boolean[] setStorageTypes(boolean[] toChange, int newStroageType) {
        if (toChange.length != files.length)
            throw new IllegalArgumentException("array length mismatches the number of files");
        if (files.length == 0)
            return new boolean[0];

        String[] types = diskManager.getStorageTypes();

        boolean[] modified = new boolean[files.length];
        DownloadManagerState dm_state = diskManager.getDownloadState();

        if (newStroageType == DiskManagerFileInfo.ST_COMPACT || newStroageType == DiskManagerFileInfo.ST_REORDER_COMPACT) {
            Debug.out("Download must be stopped for linear -> compact conversion");
            return modified;
        }

        try {
            dm_state.suppressStateSave(true);

            for (int i = 0; i < files.length; i++) {
                if (!toChange[i])
                    continue;

                int old_type = DiskManagerUtil.convertDMStorageTypeFromString(types[i]);
                if (newStroageType == old_type) {
                    modified[i] = true;
                    continue;
                }

                DiskManagerFileInfoImpl file = files[i];

                try {
                    file.getCacheFile().setStorageType(DiskManagerUtil.convertDMStorageTypeToCache(newStroageType));
                    modified[i] = true;
                } catch (Throwable e) {
                    Debug.printStackTrace(e);
                    diskManager.setFailed(file, "Failed to change storage type for '" + file.getFile(true) + "': "
                            + Debug.getNestedExceptionMessage(e));
                    break;
                } finally {
                    types[i] = DiskManagerUtil.convertCacheStorageTypeToString(file.getCacheFile().getStorageType());
                }
            }

            dm_state.setListAttribute(DownloadManagerState.AT_FILE_STORE_TYPES, types);

            DiskManagerUtil.doFileExistenceChecks(this, toChange, dm_state.getDownloadManager(), true);

        } finally {
            dm_state.suppressStateSave(false);
            dm_state.save();
        }

        return modified;
    }
}
